(because the truth hurts lol)

The Truth Wristband is a wearable device that dynamically reflects your psycho-emotional response to the world, promoting internal states to be externalized and made into interactive forms of expression. Measuring the galvanic skin response (a marker of emotional arousal commonly used in lie detector tests), this devices lights turn from blue to red as the wearer becomes aroused. Ask the wearer an evocative question and reveal his or her inner Truth

Couldn’t I tell if he I telling the truth just by looking at him and asking  him a bunch of questions?